METAL SURFACE FINISHING WITH MAGNETIC ABRASIVE POWDER
BASED ON IRON WITH CERAMIC REFRACTORY COMPOUNDS
V. V. Nepomnyashchii,
S. M. Voloshchenko,
T. V. Mosina,
K. A. Gogaev,
M. G. Askerov,
and A. M. Miropol’skii
Translated from Novye Ogneupory, No. 11, pp. 57 – 60, November, 2013.
Original article submitted July 9, 2013.
Magnetic abrasive powders are studied, prepared by mechanical mixing of starting components in the pres
ence of surfactants and adhesive materials. It is shown that with respect to operating properties the abrasive
powders prepared are on a par with known powders prepared by spraying, sintering, grinding, and other
Keywords: magnetic abrasive treatment (MAT), surface-active substances (SAS), ÉD-20 epoxy thermoset-
ting resin, total cutting forces, powder cutting and polishing capacity, particle isometric shape, cutting angles
and cutting edge radius of curvature.
In spite of theoretical and practical results, obtained in
the field of magnetic abrasive treatment (MAT) for compo-
nents of different machines and mechanisms, it should be
noted that mainly this work has been aimed at studying ki-
netics of forming a polished layer, studying the effect of
magnetic abrasive powders on removal of microchips, and
also development of various devices and attachments for
MAT machines. Powders used for these studies have been
prepared by known methods: melting iron with refractory
compounds and spraying them, formation of a prescribed
compositions and sintering them, grinding, screening, etc.
There is no published information about powder magnetic
abrasive materials (MAM) prepared by mechanical mixing
of prescribed components,
In order to resolve this task surface-active substances
(SAS) with different viscosity (oleic acid type, transformer
oil) and thermoreactive epoxy resins (ÉD-20) have been
added to composite powders, which have been used both in
dividually, and in a mixture with SAS. Composite abrasive
powder using SAS has been prepared as follows: a calculated
amount of iron powder of prescribed fraction has been fed to
a mixer, oleic added to it, and mixed to uniform SAS distri
bution over its surface. Silicon carbide (or another refractory
abrasive) has been added to the powder treated in this way
and mixed in order to prepare a uniform mixture. In order to
improve processing and operating properties transformer oil
is added to the mixture and blended to a uniform condition.
As a result of this there was attachment of abrasive to iron
powder. The ratio of the components used was, wt.%:
50 – 52 iron powder, 40 – 42 abrasive powder, 2.5 – 3.0
oleic acid, and 2.5 – 3.5 transformer oil. Then the powder
was placed in a closed vessel and used subsequently to order.
The magnetic abrasive powder (MAP) obtained using
ÉD-20 epoxy resin was accomplished by the same process
ing scheme. Powder was placed in a baking tin for final poly
merization of epoxy resin and attachment of abrasive a ferro
magnetic surface. Oleic acid was added to the composite
abrasive powder In order to improve processing and operat
ing properties. After this powder was placed in a closed ves
sel and used to order. Abrasive powder is shown in Fig. 1.
The powder obtained is a loose aggregated mix with uniform
distribution of abrasive and other components.
In preparing composite abrasive powder by mechanical
mixing of components in presence of SAS and other organic
compounds, there is apparently physicochemical reaction of
the surfaces of starting components with organic compounds
due to functional groups COO and COOH, having within
their composition both oxygen in oxidized and sorbed condi
tions, contained at the surface of ferromagnetic material and
abrasive. The chemisorbed bond between matrix and abra
sive, and also appearance of magnetic frictional absorption
Refractories and Industrial Ceramics Vol. 54, No. 6, March, 2014
1083-4877/14/05406-0471 © 2014 Springer Science+Business Media New York
I. N. Frantsevich Institute of Materials Science Problems,
Ukraine National Academy of Sciences, Kiev, Ukraine.